[Opensim-users] Intermittent crashing - System.OutofMemoryException
Shaun Erickson
ste at smxy.org
Tue Feb 14 15:31:42 UTC 2012
Re: cat hair - no wonder my computers never die. :-)
Has anyone considered putting the flotsam disk cache in a ramfs? You get all the benefits of the disk based version, but much faster.
-ste
On Feb 14, 2012, at 10:13 AM, core <core at odosys.net> wrote:
> this is an interesting and informative thread. both fleep's and gary's
> comments about flotsam cache settings have made me wonder - exactly
> under what conditions should, if at all, flotsam memory caching be set
> to TRUE. i've tried it both ways and have seen little difference, but
> admittedly this was under moderate usage at best. since there are plenty
> of people here running live-fire instances in a variety of environments
> i was hoping to gain some insight.
>
> thanks to hiro for the excellent breakdown of .net memory usage. and to
> fleep, we all know cat hair is in fact magical and makes our gear run
> faster and smarter ;)
>
> - core
>
> On 2/14/2012 7:09 AM, Fleep Tuque wrote:
>> Thanks all for the info and thoughts, sounds like scheduling daily
>> restarts is probably the best option.
>>
>> I'm pretty sure I haven't messed with whatever the default settings
>> are for the flotsam cache, I never copy over old config files when I
>> upgrade, I go through and update by hand and usually just base
>> settings to make sure the upgrade was successful and then turn on
>> other options that we've tested.
>>
>> I have to say, it's almost funny that FleepGrid, which is running
>> Windows XP on a P4 box that was gathering dust and cat hair in the
>> basement, 4GB of RAM, and at least 8 sims full of content and scripts
>> isn't having that problem, but the new poweredge server running
>> WinServer2008, tons of RAM, and only 3 or 4 sims of content is flaking
>> out. In fact, three of the regions on the UCSIM grid are identical to
>> the ones on FleepGrid since I ported them over as OAR files, so it
>> can't be much of a difference in content..
>>
>> Think I'll try going through the log files again, I'd sure like to
>> know what's tipping the out of memory exception!
>>
>> Thanks again.
>>
>> - Chris/Fleep
>>
>> Chris M. Collins (SL/OS: Fleep Tuque)
>> Center for Simulations & Virtual Environments Research (UCSIM)
>> UCIT Instructional & Research Computing
>> University of Cincinnati
>> 406A Zimmer Hall
>> 315 College Drive
>> PO BOX 210088
>> Cincinnati, OH 45221-0088
>> chris.collins at uc.edu <mailto:chris.collins at uc.edu>
>> (513) 556-3018
>>
>> http://ucsim.uc.edu
>>
>> On Tue, Feb 14, 2012 at 7:29 AM, James Stallings II
>> <james.stallings at gmail.com <mailto:james.stallings at gmail.com>> wrote:
>>
>> Regardless the amount of RAM on your system, the .net runtime uses
>> a memory model of a specific size (2 GB) and cannot address more
>> than that except under special circumstances.
>>
>> There is a hack around, involving the use of a Visual Studio C++
>> utility to make a .net binary 'large memory aware', which will
>> allow it to address 4 GB, but then only on operating systems that
>> can address >2 GB (e.g., not 32 bit operating systems).
>>
>> Note that such measures will only help if the memory exhaustion is
>> being caused by the amount/complexity of content. If the problem
>> is truly a memory leak, this workaround will only prolong the
>> inevitable, as it will simply provide more memory for the leaking.
>>
>> I saw this problem *very* briefly in the 0.7.3 series about a
>> month ago. I never did have any indication of what was causing it,
>> and it occurred day over day, without significant changes to the
>> content. It went away just as fast as it came.
>>
>>
>>
>> FYI this is on a 25 region megaregion with >50k prims and at least
>> several rather complex scripts in play.
>>
>>
>> Cheers
>> James/Hiro
>>
>>
>> On Mon, Feb 13, 2012 at 8:39 PM, Gary Banham <banham1 at telus.net
>> <mailto:banham1 at telus.net>> wrote:
>>
>> Fleep I’m running into exactly the same problem I check the
>> flotsam cache to make sure I wasn’t using memory
>>
>> My server runs windows seven but has the same amount of memory
>> I have about 8 regions on the server some with quite a few scripts
>>
>> I rolled back the instance to 7.1.1 to see what would happen
>> and it worked fine there must be something different in the
>> way 7.2 release uses the memory
>>
>> I’m in the process of distributing the regions over a number
>> of 7.2 instances I’m not sure if that’s going to cause other
>> problems
>>
>> TC
>>
>> Gary
>>
>> *From:*opensim-users-bounces at lists.berlios.de
>> <mailto:opensim-users-bounces at lists.berlios.de>
>> [mailto:opensim-users-bounces at lists.berlios.de
>> <mailto:opensim-users-bounces at lists.berlios.de>] *On Behalf Of
>> *Fleep Tuque
>> *Sent:* February-13-12 11:06 AM
>> *To:* opensim-users at lists.berlios.de
>> <mailto:opensim-users at lists.berlios.de>
>> *Subject:* [Opensim-users] Intermittent crashing -
>> System.OutofMemoryException
>>
>> Hi all,
>>
>> Our campus opensim system (running version 0.7.2 Release in
>> grid mode) seems to intermittently be crashing the last week
>> or so and I can't figure out why or how to reproduce it. An
>> out of memory exception doesn't make sense to me, the server
>> has 24GB RAM and has very light load since we're still in
>> pilot/testing phase. No more than 5 or 6 users concurrent,
>> only a few sims with much content..
>>
>> Does this error mean anything to anyone?
>>
>> 012-02-11 18:18:33,738 ERROR - OpenSim.Application [APPLICATION]:
>>
>> APPLICATION EXCEPTION DETECTED: System.UnhandledExceptionEventArgs
>>
>> Exception: System.OutOfMemoryException: Exception of type
>> 'System.OutOfMemoryException' was thrown.
>>
>> at System.Threading.Thread.StartInternal(IPrincipal principal,
>> StackCrawlMark& stackMark)
>>
>> at System.Threading.Thread.Start()
>>
>> at Amib.Threading.SmartThreadPool.StartThreads(Int32 threadsCount)
>>
>> at Amib.Threading.SmartThreadPool.Enqueue(WorkItem workItem,
>> Boolean incrementWorkItems)
>>
>> at
>> Amib.Threading.SmartThreadPool.QueueWorkItem(WorkItemCallback
>> callback, Object state)
>>
>> at OpenSim.Framework.Util.FireAndForget(WaitCallback callback,
>> Object obj)
>>
>> at
>> OpenSim.Region.ClientStack.LindenUDP.LLUDPServer.PacketReceived(UDPPacketBuffer
>> buffer)
>>
>> at OpenMetaverse.OpenSimUDPBase.AsyncEndReceive(IAsyncResult iar)
>>
>> at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
>>
>> at System.Net.ContextAwareResult.CompleteCallback(Object state)
>>
>> at System.Threading.ExecutionContext.runTryCode(Object userData)
>>
>> at
>> System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode
>> code, CleanupCode backoutCode, Object userData)
>>
>> at
>> System.Threading.ExecutionContext.RunInternal(ExecutionContext
>> executionContext, ContextCallback callback, Object state)
>>
>> at System.Threading.ExecutionContext.Run(ExecutionContext
>> executionContext, ContextCallback callback, Object state)
>>
>> at System.Net.ContextAwareResult.Complete(IntPtr userToken)
>>
>> at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object
>> result, IntPtr userToken)
>>
>> at
>> System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32
>> errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
>>
>> at
>> System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32
>> errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
>>
>> Application is terminating: True
>>
>> Any pointers or advice appreciated!
>>
>> - Chris/Fleep
>>
>> Chris M. Collins (SL/OS: Fleep Tuque)
>>
>> Center for Simulations & Virtual Environments Research (UCSIM)
>>
>> UCIT Instructional & Research Computing
>>
>> University of Cincinnati
>>
>> 406A Zimmer Hall
>>
>> 315 College Drive
>>
>> PO BOX 210088
>>
>> Cincinnati, OH 45221-0088
>>
>> chris.collins at uc.edu <mailto:chris.collins at uc.edu>
>>
>> (513) 556-3018 <tel:%28513%29%20556-3018>
>>
>> http://ucsim.uc.edu
>>
>>
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>>
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